Bonnie Wright.
Ronald Weasley is played by Rupert Grint in all of the Harry Potter movies.
John Hurt
Julian Glover provided the voice for Aragog in Harry Potter and the Chamber of Secrets. The creature was computer animated.
None. Ron Weasley did not play any character. Ron Weasley IS a character. The ACTOR who played him is Rupert Grint. Also, there is no film named "Harry Potter". There are (currently) 6 films in a series that can be called "Harry Potter films", with names such as "Harry Potter and the Chamber of Secrets" and "Harry Potter and the Order of the Phoenix". So far, Rupert Grint has played Ron Weasley in all of the films. There will be two more films in the series, and I suspect Rupert Grint will continue to play the role of Ron Weasley in both of them.
The English actor Christian Coulson played the teenage version of Tom Marvolo Riddle in Harry Potter and the Chamber of Secrets.
Chris Rankin has: Played himself in "Smile" in 2002. Played Percy Weasley in "Harry Potter and the Chamber of Secrets" in 2002. Played Percy Weasley in "Harry Potter and the Prisoner of Azkaban" in 2004. Played himself in "Ministry of Mayhem" in 2004. Played Henry Evelyn Wood in "Victoria Cross Heroes" in 2006. Played Chris Haines in "Explode, Chapter Two: Into the Fold" in 2006. Played Percy Weasley in "Harry Potter and the Order of the Phoenix" in 2007. Played himself in "Total Wipeout" in 2008. Played Percy Weasley in "Harry Potter and the Deathly Hallows: Part 2" in 2011. Played Young man in "Gracie" in 2014.
Daniel Radcliffe (born July 23, 1989) was 12 years old during filming of the second Harry Potter movie, Chamber of Secrets, in early 2002, and was 13 when the movie was released in November 2002.
In the Chamber of Secrets the actor who played Mrs. Granger was Heather Bleasdale.
Oliver Phelps has: Played himself in "Today" in 1952. Played George Weasley in "Harry Potter and the Chamber of Secrets" in 2002. Played George Weasley in "Build a Scene" in 2003. Played himself in "This Week" in 2003. Played George Weasley in "Creating the Vision" in 2004. Played himself in "Head to Shrunken Head" in 2004. Played himself in "Ministry of Mayhem" in 2004. Played himself in "The Mysti Show" in 2004. Played George Weasley in "Harry Potter and the Prisoner of Azkaban" in 2004. Played George Weasley in "Harry Potter and the Goblet of Fire" in 2005. Played Himself - Guest in "El hormiguero" in 2006. Played himself in "Preparing for the Yule Ball" in 2006. Played himself in "Reflections on the Fourth Film" in 2006. Played George Weasley in "Harry Potter and the Order of the Phoenix" in 2007. Played Finlay Anderson in "Kingdom" in 2007. Played himself in "Live from Studio Five" in 2009. Played George Weasley in "Harry Potter and the Half-Blood Prince" in 2009. Played George Weasley in "Harry Potter and the Deathly Hallows: Part 1" in 2010. Played himself in "Daybreak" in 2010. Played himself in "RingCon 2010" in 2010. Played George Weasley in "Harry Potter and the Forbidden Journey" in 2010. Played George Weasley in "Harry Potter and the Deathly Hallows: Part I" in 2010. Played George Weasley in "Harry Potter and the Deathly Hallows: Part 2" in 2011. Played himself in "Pointless Celebrities" in 2011. Played Himself - The Weasley Twins in "50 Greatest Harry Potter Moments" in 2011. Played himself in "Creating the World of Harry Potter, Part 8: Growing Up" in 2012. Played Mr. Ears in "Ears" in 2013. Played Constable Stroyde in "Own Worst Enemy" in 2014.
Kenneth Branagh acts as Professor Lockhart.
Christian Coulson played young Tom Marvolo Riddle in Harry Potter and the Chamber of Secrets.
Bonnie Wright has: Played herself in "Today" in 1952. Played herself in "Blue Peter" in 1958. Played herself in "HBO First Look" in 1992. Played herself in "Loose Women" in 1999. Played Ginny Weasley in "Harry Potter and the Chamber of Secrets" in 2002. Played Young Sarah in "Stranded" in 2002. Played herself in "Interviews with Students" in 2003. Played Ginny Weasley in "Build a Scene" in 2003. Played Young Agatha in "Agatha Christie: A Life in Pictures" in 2004. Played herself in "Ministry of Mayhem" in 2004. Played Ginny Weasley in "Harry Potter and the Prisoner of Azkaban" in 2004. Played Ginny Weasley in "Harry Potter and the Goblet of Fire" in 2005. Played Ginny Weasley in "Preparing for the Yule Ball" in 2006. Played Vanessa in "The Replacements" in 2006. Played herself in "Reflections on the Fourth Film" in 2006. Played Ginny Weasley in "Harry Potter and the Order of the Phoenix" in 2007. Played Ginny Weasley in "Harry Potter and the Half-Blood Prince" in 2009. Played Ginny Weasley in "Harry Potter and the Deathly Hallows: Part 1" in 2010. Played herself in "Daybreak" in 2010. Played herself in "Creating the World of Harry Potter, Part 4: Sound and Music" in 2010. Played Ginny Weasley in "Harry Potter and the Forbidden Journey" in 2010. Played Ginny Weasley in "Harry Potter and the Deathly Hallows: Part I" in 2010. Played herself in "National Movie Awards" in 2010. Played Ginny Weasley in "Harry Potter and the Deathly Hallows: Part 2" in 2011. Played herself in "National Movie Awards" in 2011. Played Herself - Ginny Weasley in "50 Greatest Harry Potter Moments" in 2011. Played Phoebe in "Before I Sleep" in 2013. Played Mia in "Geography of the Hapless Heart 2" in 2013. Played Georgina in "The Philosophers" in 2013. Played Zoe in "Those Who Wander" in 2014. Played Mia (segment "London") in "Geography of the Heart" in 2014. Played Hannah in "All Hail the Squash Blossom Queen" in 2015.